Fix stuck fading animation for series highlighting
Fix stuck fading animation for series highlighting

The animateId field wasn't being initialized correctly if
clearSelection() got called before the first call to setSelection().

TODO(klausw): add more generic support for animating changes to option
values?

witsa/dygraphs,witsa/dygraphs,klausw/dygraphs,vhotspur/dygraphs,timeu/dygraphs,pshevtsov/dygraphs,davidmsibley/dygraphs,mantyr/dygraphs,danvk/dygraphs,mariolll/dygraphs,Akiyah/dygraphs,reinert/dygraphs,pshevtsov/dygraphs,petechap/dygraphs,kbaggott/dygraphs,mantyr/dygraphs,davidmsibley/dygraphs,jmptrader/dygraphs,Yong-Lee/dygraphs,vhotspur/dygraphs,mariolll/dygraphs,socib/dygraphs,timeu/dygraphs,davidmsibley/dygraphs,davidmsibley/dygraphs,pshevtsov/dygraphs,danvk/dygraphs,mariolll/dygraphs,panuhorsmalahti/dygraphs,witsa/dygraphs,cavorite/dygraphs,mantyr/dygraphs,kbaggott/dygraphs,kbaggott/dygraphs,witsa/dygraphs,danvk/dygraphs,Akiyah/dygraphs,mcanthony/dygraphs,Akiyah/dygraphs,klausw/dygraphs,danvk/dygraphs,mcanthony/dygraphs,cavorite/dygraphs,kbaggott/dygraphs,vhotspur/dygraphs,Yong-Lee/dygraphs,mcanthony/dygraphs,grantadesign/dygraphs,cavorite/dygraphs,petechap/dygraphs,panuhorsmalahti/dygraphs,socib/dygraphs,mcanthony/dygraphs,timeu/dygraphs,Yong-Lee/dygraphs,petechap/dygraphs,reinert/dygraphs,grantadesign/dygraphs,mariolll/dygraphs,grantadesign/dygraphs,davidmsibley/dygraphs,petechap/dygraphs,panuhorsmalahti/dygraphs,petechap/dygraphs,socib/dygraphs,panuhorsmalahti/dygraphs,jmptrader/dygraphs,grantadesign/dygraphs,socib/dygraphs,danvk/dygraphs,vhotspur/dygraphs,pshevtsov/dygraphs,pshevtsov/dygraphs,reinert/dygraphs,timeu/dygraphs,mantyr/dygraphs,vhotspur/dygraphs,mariolll/dygraphs,kbaggott/dygraphs,Yong-Lee/dygraphs,mantyr/dygraphs,klausw/dygraphs,Akiyah/dygraphs,jmptrader/dygraphs,reinert/dygraphs,klausw/dygraphs,jmptrader/dygraphs,grantadesign/dygraphs,klausw/dygraphs,panuhorsmalahti/dygraphs,reinert/dygraphs,cavorite/dygraphs,timeu/dygraphs,Yong-Lee/dygraphs,mcanthony/dygraphs,witsa/dygraphs,jmptrader/dygraphs,Akiyah/dygraphs